EuCARD-2 is co-funded by the partners and the European Commission under Capacities 7th Framework Programme, Grant Agreement 312453

Co-ordinators:Peter McIntosh (STFC Daresbury Laboratory)

Nicoleta Baboi (DESY)Juliette Plouin (CEA)

WP12: Innovative RF Technologies

EUCARD-2 Steering CommitteeDaresbury Laboratory, 19 Mar 2014

Task 12.1 Management & Coordination (P McIntosh – STFC)

• WP12 Annual Review being arranged:– 16-17 April 2014 @ CEA Saclay– https://indico.cern.ch/event/301619/

• Milestones:– MS73, Commissioning of the SAPI for operation with metal photocathodes,

STFC, Completed– MS74, Design concept RF front end, PSI, Under Preparation, Due M12– MS75, Investigation of quantum yield and energy spectrum of the electrons,

emitted from the metal photocathode surface in SAPI, STFC, Due M18• Deliverables for M18:

– D12.1, Deposition test facilities implemented and verified at CERN and INPG, CERN.

– D12.2, Initial progress report of task 12.3, CERN.– D12.3, Design of electronics for XFEL HOM diagnostics, DESY.– D12.4, Scientific report on photocathode R&D, STFC.

Task 12.2 Thin Films (C Antoine – CEA)

CEA Saclay• Modification of the magnetometer underwayINP Grenoble• ALD deposition set-up delivered• CVD deposited NbN samples have been characterized.CERN• Sample study ongoing w. Sheffield U. to study biased HIPIMSHZB Berlin• Quadrupole resonator close to final fabrication (presently

BCP at JLAB)• Design of a special sample holder for small flat sample

underway

Progress since May 2013 will be presented at the April WP12 meeting

ALD @ INP Grenoble

Task 12.3 High Gradient NC (W Wuensch – CERN)

Recruitment:• CEA Saclay – Post-doc hired, begins in April.• Lancaster – Two PDRAs hired, began in January• PSI – Post-doc hired, began in NovemberUpcoming deliverables:• D12.2 Initial progress report M18 – dedicated effort to begin in four months or so.Technical progress highlights:• PSI has made initial beam-based measurements and evaluated optical

components.• Lancaster has tuned crab-cavity.• CEA Saclay has made preliminary particle studio simulations of klystron.Overall assessment• Lengthy process of finding and hiring means that real momentum on technical

work is just beginning. Nonetheless all work plans have been studied in sufficient detail to allow technical work to start.

Task 12.4: HOM Beam Diagnostics (R Jones – UMAN)

• Aim: HOM-based beam phase and position diagnostics for the E-XFEL SC cavities(1.3 and 3.9 GHz)

• Experimental work:– HOM Measurements at FLASH to study

stability of signals, correlation to detuning(1.3 GHz cavities)

– Design of electronics for 1.3 and 3.9 GHz electronics for the E-XFEL on going

– Recently FNAL electronics commissioning: 3.9 GHz cavities/FLASH• Staffing:

– 1 UMAN Ph.D. student, L. Shi, based at DESY since Aug. 2013 participating in measurements and working closely with N. Baboi

– 1 UROS Ph.D. student, T. Flisgen, focused on complete module simulation and implications of fabrication and measurement errors via customised codes

– 1 PDRA Dr. P. Jain, based at Manchester since April 2013 focused on module and HOM beam-excitation simulations. He has also spent 1 week at DESY participating in experiments

UHV Arc Deposition Ion Bombardment Rod Plasma Injection

WP 12.5 RF PhotocathodesHZB• Study high brightness PCs, with high average current,

SRF gun integration processes. – Diamond Amplifier Cathode (DAC) and Diamond Field

Emitter Array (DFEA) photocathodes.• FE system setup to study PC materials and substrates.

DFEA PCs currently being evaluated.DESY and NCBJ• SRF gun cavity tested at DESY/Jlab upto cathode field of

55 MV/m. Improved Pb PC plug cooling incorporated.• New Pb PC diagnostic being prepared at NCBJ.STFC• New metal PC preparation/analysis system

commissioned, provides Spectroscopy, AFM, work function and QE characterisation.

• MS74 details system and its commissioning.HZDR• New SRF gun to be installed on ELBE in May 14.• 4 x Nb plugs polished and will be Pb coated by NCBJ.

6

Milestones and Deliverables due up to M12 (30.04.2014)

Report no.

(D/M)

Title Beneficiary Due date Status

MS73Commissioning of the SAPI for operation with metal photocathodes.

STFC M8(31-12-13)

Completed M9(30-01-14)

MS74 Design concept RF front end. PSI M12(30-04-14)

Delayed to M14 (31-06-14)

Due to delayed post-doc

appointment.

Summary on Communication

• Scientific papers submitted relevant to the project

• Attended events (with EuCARD-2 presentation)

Author Title Link

C.B. Baumier (IPNO)Task 12.2

Multilayers Activities at Saclay / Orsay SRF 2013 http://ipnweb.in2p3.fr/srf2013/papers/weioc02.pdf

M Dehler (PSI)Task 12.3

Wake field monitors in a multi purpose X Band accelerating structure

IBIC13: http://accelconf.web.cern.ch/AccelConf/IBIC2013/papers/webl3.pdf

T Flisgen (UROS)Task 12.4

Scattering parameters of the 3.9 GHz accelerating module in a free-electron laser linac: A rigorous comparison between simulations and measurements

Phys. Rev. ST Accel. Beams 17, 022003 (2014)

R. Barday (HZB)Task 12.5

Characterization of a superconducting Pb photocathode in a superconducting rf photoinjector cavity

Phys. Rev. ST Accel. Beams 16, 123402 – Published 6 December 2013

Title of event Date Venue Outreach event?

Attendance Link to event or report

CLIC Workshop 5/2/14 CERN N All Task 12.3 Collaborators

http://indico.cern.ch/event/275412/

Summary on Communication - 2

• Upcoming events (workshops, meetings, etc.)

• Potential topics/results for Accelerating News– Performance breakthrough for SRF thin film, utilising multi-layer,

high Tc technologies.– Breakdown free performance capability demonstrated for

>100MV/m NC RF structures.– High performance beam position diagnostic demonstrated for XFEL.– High performance (intensity, emittance) photocathodes

demonstrated for SRF and NC applications.

Title of event Date Venue LinkWP12 Annual Review 16-17 Apr 2014 CEA Saclay https://indico.cern.ch/event/301619/IPAC14 16-20 Jun 2014 Dresden http://www.ipac14.org/

WP12 Website

WP12 website can be found here: http://www.cockcroft.ac.uk/events/WP12/